Drill.



d R. R.- HOPKINS;

DRILL. APPLICATION FILED SEPT. 25, 1907.

Patented Oct; 13, 1908.

0 g] Hopzi Wi :10 use:

' u ona frame comprising a Riemann. HOPKINS, or'osKALoosA," IOWA.

; DRILL.

' Specification of Letters Patent.-

Patented Oct. 13, 1968.

'f Application filed September 25, 1901. Serial no. 394,531;

To all'wiwm it may-concem: 1 r

Be it known thatI, RICHARD R; HOPKINS, citizen of the United States, residing at-Oskaloosa, in .munty of Mahaska and State of Iowa, havt vented certain new'and useful I ULPI'OVBIIIGDL. in Drills,-of which the following is a specification. 4

The present invention. relates, to certain new and useful improvements in .miners drills, and more particularly to a novel mechanism for rotating and feeding the drill shaft, and a novel means for adjustablyl supporting the drill mechanism.

The object of-the inventionisito design a.

miners drill which is of sim le .and durable construction and can be readily operated by a sin le man. I

or a full descri tion of the invention and in bar. Fig. 2 is a side elevation showing the drill mechanism as mounted upon a post.

Fig. 3 is an enlarged sectional view throu h the gear wheels for feeding and rotating t e drill shaft. Fig. 4 is an enlarged detail view of one of the bearin s. Fig. 5 is a perspective view showing t e manner of attaching the bar carrying the drill frame to the post. Fig. 6 isan enlarged detail view of the connection between the supportingbar and the drill frame. Fig. 7 is a' detail view of the tongue at the end of the bar to which the frame is attached.

Corresponding and like parts. are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The drill mechanism pro er is mounted v ar 1 having a of arms 2v projecting laterally therep uralitg rom. n the present instance three of the I arms 2 are provided and gear wheels 4 and 5- are journaled between the same, the said gear wheels receiving the drill-shaft 6. This drillshaft 6 slides freely through the gear wheel 5 but rotates therewith since it is provided with a longitudinal groove 7 receiving a projection upon the said gear wheel. The op posite gear wheel 4 is interiorlythreaded; and cooperates with the threaded exterior of the drill shaft to feed the latter. In the preferred form of the invention this gear wheel 4 is formed in two sectionswhioh are ap lied to the drill shaft 6 from opposite sides t ereof, the saidsectionsof the wheel being normally held together by collars 8 at the ends thereof which are engaged by hinged portions 10 alsoprojects from the bar 1 .i is formed with a caring u on which the drive wheel .11 is jo'urnaled,'t c said drive wheel being provided with 'twoco'ncentri'c rows of teet 12 and 13 engagingrespectivelythe gear wheels 4 and 5 Itwill thus be apparent that as the drive wheel is rotated t e gear wheels 4 and 5 will revolve upon their bearings, the former serving to feed the drive shaft whilethe latter causes the same to rotate. Owing tothe fact that the rows 12 and 13 of teeth upon the drive wheel are m concentric circles, the row 13 being spaced- '9 oft-he bearings upon the arms 2. a A bracket one end of the same, the projecting end .of

the said bar terminating in a tongue 16 having a transverse opening 17 near the extremity thereof and also provided toward its base with a similar opening 18. It will also be observed that perforated lugs 19 from opposite sides of the tongue at t 10 base thereof. This-bar 15 may be secured either to a post 20 orto a supporting rod 21 according to the conditions under which the drill is being operated.

The post 20 is of the conventional construction and comprises spaced sides provided with corresponding perforations 22, means bein provided at the opposite ends of the post or engaging the to. and bottom of a drift. In app yi the ar 15 to the post 20 the ton e 16 is inserted between the spacedsides t ereof and a bolt or pin 23 passed through one of the openings in the tongue 1 and a selected pair of the iperforations 22 in the sides of the Ipost. he drill shaft 6 theirivpjperates atrig t angles to the post andit roject be readilyapparent that the frame can be vertically adjusted upon the 0st by causing the pin 23 to engage in a seeeted pair of perforations 22 therein.

. The supporting rod 21 is employed for holding the drill frame in an operative position when the drill shaft is arranged approximately in alinement with the support.- One end of this supporting rod 21 is provided with the teeth 24 for engaging the coal or rock while the opposite end is bifurcated at 2:) to receive the tongue 16 of the bar 18. The two arms of the bifurcation 25 are provided at their base with the openings 26 corresponding to the opening 17 of the tongue 16, and at their ends with the openings 27 corresponding to the openings 18 of the tongue. It will also be observed that the arms of the bifurcation are provided upon their opposite sides with the perforated lugs 28 corres )ond ing to the lugs 19 of the tongue 16. In

curing the tongue 16 within the bifurcation a pin 29 is inserted through the corresponding openings 26 and 17 and a second pin 30 is inserted through any selected openings at the outer end of the bifurcation and the base of the tongueor the ears projecting from said members according to the inclination at which it is desired to hold the drill shaft. In either instance it will be readily apparent that after being properly supported either through the medium of the post 20 or the supporting rod 21 the drill shaft can be rotated and fed forwardly by turning the drive wheel 11.

Having thus described the invention, what 1 gear wheel together, and a drive wheel mounted upon the frame and provided with concentric rows of teeth engaging the gear wheels.

2. In a drill, the combination of a frame provided with bearings formed with hinged portions, a drill shaft, a gear wheel jenrnaled E within the bearings and having a threaded engagement with the drill shaft, the said gear wheel being in sections and formed with collars engaged by the hinged portions of the hearings to hold the sections of the gear wheel together, and means for rotating the shaft and gear wheel at a differential speed. In testimony whereof I affix my signature in presence of two witnesses.

RICHARD It. HOPKINS. [L. .s] Witnesses:

Lis'roN MoMnm w, G. B. Row. 

